Production of color photographs



PatentcdJamZl, 1941 i UNITED -STATES; PATENT OFFICE I 'raonno'rioiv :212:12; rno'rooanrns I Wilhelm Schneider, Dessau, Germany, assignor, by meme assignments, to General Aniline & Film Corporation, New York, N. Y., a corporation of Delaware No Drawing. Application June iv, 1937, Serial No, 148,731. In Germany June 26, 1936 3 Claims. '(01. 95-2) The present invention relates to color photoing a support, a silver halide gelatin emulsion p sz layer sensitized to red and containing the sodi- One of its objects is to provide an improved um salt of -1-N-stearoyl-4-N-(1'-hydroxy-2- process of producing multi-color photographs. naphthoyl)-phenylenediaminesulfonic acid as a 5 Further objects will be seen from the detailed dyestufi component, a second emulsion layer sen- 6 specification following hereafter. sitized to green and containing 1 -(5'-sulfo-3'- It has been proposed to prepare by the reverstearoylaminophenyl)-pyrazolone sodium as a sal process color pictures from a multi-layer madystufi component and a not specially sensitized terial, individual layers of which contain dyestuff third emulsion layer containing m-stearoyli0 formers, and to apply the chromogenlc develop amino-benzoylacetanilide-p'-carboxylic acid as a 10 ment only for the second development. dyestufi component is exposed and developed in,

When this process is applied. in practice, for the following working steps: example for narrow films, it is necessary either First development mi Ami-doll that the ,existing developing machines should'be so constructed that they are applicable both.for e u t aye m e al s t eated fO f 15 m 15 black and white reversal pictures in the usual Iii/B5 in an AmidOl developer Consisting of Q manner and for chromogenie second 'develop- Of Water, 5 grams of AmidOl, 50 0f 80(11- ment, or to provide separate developing ma i um sulfite sicc. and 1 gram of potassium bromide for exposures to be chromogenically developed. i then w ed for 10 minutescmsidembly mrease the 2; First bleaching with chromic acid v This invention relates toa novel chromogenic T P is treated for minutes m a developing Process which differs from those that composltlon O Of Water- 5 a of are known as .f 11 chromicanhydride and 30 grams of sodium sul- The material is developed after the exposure fite or in a of 1000 of water 25 in the existing developing ma hi any 4 grams of potassium bichromate and 25 cc. of k wn manner t produce black and white sulfuric acid of 10 per cent strength and then reversal positive.' On inspection the picture obwashed 10 l ll es- After clar1fymg f tained cannot be distinguished from an ordinary minutes in a Sqdmm sulfite solution. of 3 r e t reversal positive. In fact, however, this posi- [strength the material is washed 5 mmutes- 30 tive consists of tcomponent positives in the layers 3. lite-exposure which constitu e the multi-layer material. The layers contain the still unchanged dyestuff cbm-.- second development with ponents as described for'instance in U. S. patent After developing for 10 minutes in a composiapplications Ser. No. 72,718 filed April 4, 1936; tion of 1000 cc. of water, 5 grams of Amidol, 50 35 Ser. No. 90,726 filed July 15, 1936; Ser. No. 94,340 grams of sodium sulfite sicc. and 1 gram of pofiled August 5, 1936; and Ser. No. 126,842 filed tassium bromide or for 5 minutes in an Agfa I February 20, 1937. a negative developer the material is washed for 10 In a simple developing apparatus this mateminutes.

40 rial is now subjected in daylight tore-sensitiz- Y a 40 mg, and then the silver component pictures 1 Second bleaching chromic amd .changed into exposed silver salts are developed .The material is treated for 3 minutes in a to color pictures containing silver, from which composition of 1000 cc. of water, 5 .grams of pictures the silver may be removed in known chromic anhydride and 50 grams of sodium ch10 5 manner, for instance by the Farmers reducer. ride or in a solution of 1000 cc. of water, 4 grams This process of developing requires merely the of potassium bichro nate, 25 cc. of hydrochloric installation of a simple additional apparatus reacid of 10 per cent strength and 20 grams of quiring but little manipulation. The finishing sodium chloride and then washed for 10 minof the black and white positive affords an op utes.

portunity for examining the picture and noting 6. Secondve-exposure 50 anycorrections which may be necessary, these being made before the final 'colordevelopment. a [Color development The following example serves to illustrate the After a treatment for 10 minutes in a bath invention: 4 containing 1000 cc. of water, 0.5 gram of sodium A photographic multi-layer material comprissulfite $100., 2.5 grams of p-diethyl-amino-ani- 55 gramswf sodium carbonate the material is washed for" 25 minutes.

s. Bleaching with potassium ,ferricuantde .The material. is treated for 6 minutes in a solution or 1000 cc. of water, 50 grams of potassium ferricyanide and 50 grams of sodium chloride.

9. Fixin The bath is made by dissolving 300 grams of sodium thiosulfate in 1000 cc. of water.

The temperature of theabove cited baths .is

are at hand, thereby keeping it from being deleteriously affected.

.What I claim is:

l. A process of producing multi-color photo- Q graphs which comprises producing a multi-layer photographic material having incorporated in the several silver halide emulsion layersdyestufl com-" ponents capable of forming dyestufls with a developer adapted for color development, said dye- 'stufl component although soluble in aqueous liquids being per se incapable oi difiusing with respect to the binding agent of the emulsion layer, forming positive silver component images in said layers by a reversal process with processing solutions WhiChfiJB incapable of forming dyestufis with said dyestufi components, bleaching said silver images to silver salt imagesrendering said silversalt images developable, transforming said images intosilver and color component images in a developer capable of forming dyestuffs with said dyestufl components, and removing the developed silver from said photographic material.

line, 2.5 grams oi potassium bromide and 30 2. A process of producing multi-color photographs, which comprises producing a multi-layer film having incorporated in the several silver 'halide'emulsion layers dyestui! components capable of torming dyestufls with a developer adapted for color development, said dyestufl components being last to diffusion with respect to the binding agent of the emulsion layer, forming latent images, developing said images in a developer not capable 01 forming dyestuil's with said dyestufl components, dissolving the silver from the negative by treatment in a bleaching bath, iorming latent images ,in the remaining silver halide, developing said images in a developer corresponding to the first development step, forming silver halide images by treatment in a bleaching bath, forming latent images, transforming said'images into silver and color images in a developer capable of forming dyestufis with said dyestuil components, and removing the developed silver from said film? '3. A. process of producing multi-color photographs,.which comprises producing a multi-layer film having incorporated in the several silver halide emulsion layers dyestufl components capable of forming dyestuffs with a developer adapted for color development, said dyestuilf components being fast to diffusion with respect to the binding agent of the emulsion layer, forming latent images, developing said images in a developer not capable of forming dyestufls with said dyestufi components, dissolving the silver from the negative by treatment in ableaching bath,

forming latent images in the remaining silver halide, developing said images in adeveloper correspondingto the first development step, forming silver halide images by treatment in a bleaching bath, Iorming latent images, transforming said images into silver and color-images in a developer-capable of forming dyestuffs with said dyestufl components, removing the developed silver from said film, and fixing the produced 001- ored positive. 

